Acquisitions (Assets Acquired and Liabilities Assumed) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Apr. 30, 2014
Business Acquisition [Line Items]
Goodwill	$ 3,249	$ 3,272
National Pump
Business Acquisition [Line Items]
Accounts receivable, net of allowance for doubtful accounts			44	[1]
Inventory			19
Deferred taxes			6
Rental equipment			172
Property and equipment			10
Intangibles			289	[2]
Other assets			1
Total identifiable assets acquired			541
Current liabilities			(25)
Total liabilities assumed			(25)
Net identifiable assets acquired			516
Goodwill			333	[3]
Net assets acquired			849
Accounts receivable, gross			47
Goodwill, amount expected to be deductible for income tax purposes			321
Estimated uncollectible receivables			3
Trench, power and pump | National Pump
Business Acquisition [Line Items]
Goodwill			321	[3]
General rentals | National Pump
Business Acquisition [Line Items]
Goodwill			$ 12	[3]

[1] The fair value of accounts receivables acquired was $44, and the gross contractual amount was $47. We estimated that $3 would be uncollectible.

[2] The following table reflects the estimated fair values and useful lives of the acquired intangible assets identified based on our purchase accounting assessments: Fair value Life (years) Customer relationships$27410 Non-compete agreements156 Total$289

[3] $321 of the goodwill was assigned to our trench, power and pump segment and $12 of the goodwill was assigned to our general rentals segment. The level of goodwill that resulted from the acquisition is primarily reflective of National Pump's going-concern value, the value of National Pump's assembled workforce, new customer relationships expected to arise from the acquisition, and operational synergies that we expect to achieve that would not be available to other market participants. $321 of goodwill is expected to be deductible for income tax purposes. The amount of goodwill that is expected to be deductible for income tax purposes declined during the three months ended March 31, 2015 due to a decline in the fair value of the contingent cash consideration component of the National Pump purchase price due to lower than expected financial performance compared to agreed upon financial targets, as discussed in note 6 to our condensed consolidated financial statements.